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Few-photon scattering in dispersive waveguides with multiple qubits.

Şükrü Ekin Kocabaş

    Optics Letters
    |June 1, 2016
    PubMed
    Summary

    Researchers extended numerical simulations for quantum systems to study multiple qubits interacting with photons. They analyzed photon scattering, identified bound states in the continuum (BICs), and used BICs to improve quantum gate fidelity, aiding future quantum computing development.

    Area of Science:

    • Quantum optics
    • Quantum information science
    • Computational physics

    Background:

    • Simulating quantum systems with multiple interacting qubits is computationally challenging.
    • Understanding photon scattering and bound states in the continuum (BICs) is crucial for quantum technologies.

    Purpose of the Study:

    • To extend Krylov-subspace methods for simulating time-dependent problems involving multiple qubits and photons.
    • To analyze photon scattering from two qubits and derive expressions for BICs.
    • To investigate the application of BICs in quantum gates and assess their fidelity.

    Main Methods:

    • Krylov-subspace-based time-dependent numerical simulations.
    • Analysis of photon scattering dynamics for two-qubit systems.
    • Derivation of bound states in the continuum (BICs) expressions.

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  • Application of BICs in a Pauli-Z quantum gate protocol.

    • Main Results:

    • Successful extension of numerical techniques to multiple qubits.
    • Derivation of BIC expressions and demonstration of their excitation.
    • Achieved high gate fidelity using BICs in a decoherence-free subspace.
    • Quantified gate fidelity dependence on gate parameters.

    Conclusions:

    • The developed numerical techniques are effective for simulating complex quantum systems with multiple qubits and time-dependent Hamiltonians.
    • Bound states in the continuum offer a promising route for high-fidelity quantum gate operations.
    • This work provides a framework for studying quantum gate dynamics and many-body systems with multiple perturbations.